The Revenge of the Battle-Cars Add-on for Rocket League has 5 achievements.
Equip the Shark Fin Topper and win an Unfair Bot Match
Win the MVP award using Scarab or Zippy
Win a game against All-Star Bots with the Hearts Decal equipped
Win an Online Match with Scarab or Zippy
Use the Accelerato Boost with an original Battle-Car while playing in a SARPBC-inspired arena